bpo-40286: Add randbytes() method to random.Random (GH-19527)

Add random.randbytes() function and random.Random.randbytes()
method to generate random bytes.

Modify secrets.token_bytes() to use SystemRandom.randbytes()
rather than calling directly os.urandom().

Rename also genrand_int32() to genrand_uint32(), since it returns an
unsigned 32-bit integer, not a signed integer.

The _random module is now built with Py_BUILD_CORE_MODULE defined.

1 files changed, 2 insertions, 1 deletions

diff --git a/setup.py b/setup.py
index 65a1cfa..d241dc0 100644
--- a/setup.py
+++ b/setup.py
@@ -808,7 +808,8 @@ class PyBuildExt(build_ext):
         self.add(Extension('_datetime', ['_datetimemodule.c'],
                            libraries=['m']))
         # random number generator implemented in C
-        self.add(Extension("_random", ["_randommodule.c"]))
+        self.add(Extension("_random", ["_randommodule.c"],
+                           extra_compile_args=['-DPy_BUILD_CORE_MODULE']))
         # bisect
         self.add(Extension("_bisect", ["_bisectmodule.c"]))
         # heapq